package demo1;

import java.util.Arrays;
import java.util.Comparator;

class Student {
    public String name;
    public int age;
    public int score;

    public Student(String name, int age, int score) {
        this.name = name;
        this.age = age;
        this.score = score;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", score=" + score +
                '}';
    }
}

class AgeComparator implements Comparator<Student>{

    @Override
    public int compare(Student o1, Student o2) {
        return o1.age - o2.age;
    }
}

class ScoreComparator implements Comparator<Student>{

    @Override
    public int compare(Student o1, Student o2) {
        return o1.score - o2.score;
    }
}

class NameComparator implements Comparator<Student>{

    @Override
    public int compare(Student o1, Student o2) {
        return o1.name.compareTo(o2.name);
    }
}

public class Test {

    public static void main(String[] args) {
        Student[] students = new Student[3];
        students[0] = new Student("zhangsan",19,93);
        students[1] = new Student("lisi",22,95);
        students[2] = new Student("wangwu",20,90);

        //比较器
        AgeComparator ageComparator = new AgeComparator();

        ScoreComparator scoreComparator = new ScoreComparator();

        NameComparator nameComparator = new NameComparator();

        Arrays.sort(students,ageComparator);
        System.out.println(Arrays.toString(students));

        System.out.println("==========");

        Arrays.sort(students,scoreComparator);
        System.out.println(Arrays.toString(students));

        System.out.println("==========");

        Arrays.sort(students,nameComparator);
        System.out.println(Arrays.toString(students));
    }

}
